SOLUTION: Kristen's financial advisor has given her a list of 12 potential investments and has asked her to select and rank her favorite four. In how many different ways can she do this?

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Question 1139489: Kristen's financial advisor has given her a list of 12 potential investments and has asked her to select and rank her favorite four. In how many different ways can she do this?
Answer by ikleyn(52817) About Me  (Show Source):
You can put this solution on YOUR website!
.

The words "select and rank" mean "to produce an ordered list".


In simple terms, the order in the list is important (does matter).


Therefore, there are  12*11*10*9 different lists/ways Kristen can do it:


    - any of 12 at the first position;

    - any of 11 remaining at the second position,


         . . .    and so on   . . . 


(standard mantra).